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+====== Daily Cartoon ======
+I want the daily cartoon of userfriendly.org show up on one of my wiki pages. Since it has another URL every day, I try to do it via a syntax plugin. Unfortunately, everything works fine on preview, but the page is garbled after saving :-(
+You can reproduce this when you save the code in a file named ''syntax.php'' in the ''lib/plugins/userfriendly'' directory of your DokuWiki installation. Then, place ''{~userfriendly~}'' in the page text (I have it on a separate line with one blank line above and one underneath) and see...
+Here's the code, maybe you can give [[w.flamme@web.de|me]] some hints what I am doing wrong.
+<code php>
+<?php
+/**
+ * userfriendly plugin: shows the daily cartoon from userfriendly.org
+ *
+/**
+ * @license    GPL 2 (http://www.gnu.org/licenses/gpl.html)
+ * @author     Werner Flamme <w.flamme@web.de>
+ * @date       2009-01-17
+ */
+if(!defined('DOKU_INC'))
+    die();
+if(!defined('DOKU_PLUGIN'))
+    define('DOKU_PLUGIN', DOKU_INC . 'lib/plugins/');
+require_once(DOKU_PLUGIN . 'syntax.php');
+/**
+ * All DokuWiki plugins to extend the parser/rendering mechanism
+ * need to inherit from this class
+ */
+class syntax_plugin_userfriendly extends DokuWiki_Syntax_Plugin {
+    /**
+     * return some info
+     */
+    function getInfo()
+    {
+        return array(
+            'author' => 'Werner Flamme',
+            'email'  => 'w.flamme@web.de',
+            'date'   => '2009-01-17',
+            'name'   => 'Userfriendly.org Cartoon Plugin',
+            'desc'   => 'Shows the daily cartoon from userfriendly org ' .
+                        'as shown on http://ars.userfriendly.org/cartoons/?id=<date>',
+            'url'    => 'http://wiki.splitbrain.org/doku.php?id=plugin:userfriendly'
+        );
+    } // function getInfo
+    /**
+    * What kind of syntax are we?
+    */
+    function getType()
+    {
+        return 'substition';
+    } // function getType
+    /**
+    * What kind of plugin are we?
+    */
+    function getPType()
+    {
+        return 'block';
+    } // function getPType
+    /**
+    * Where to sort in?
+    */
+    function getSort()
+    {
+        return 300;
+    } // function getSort
+    /**
+    * Connect pattern to lexer
+    */
+    function connectTo($mode)
+    {
+        $this->Lexer->addSpecialPattern('{~userfriendly~}', $mode, 'plugin_userfriendly');
+    } // function connectTo
+    /**
+     * Handle the match
+    */
+    function handle($match, $state, $pos)
+    {
+        return array();
+    } // function handle
+    /**
+     * Create output
+     @param $mode       current mode of DokuWiki (see http://wiki.splitbrain.org/plugin:tutorial)
+     @param $renderer   DokuWiki's rendering object
+     @param $data       the data between '\<userfriendly' and '/>' tags (not looked at)
+     @var   $pagearr    the starting page of userfriendly.org (as array)
+     @var   $line       that's what $pagearr consists of
+     @var   $srcpos     position of the line where SRC= starts
+     @var   $srclen     length of the URL after SRC=
+     @var   $picid      the URL of the daily cartoon
+     @var   $linkstart  constant expression to start the link tag with
+     @var   $imgalt     constant expression for the alt attribute of the img tag
+     @var   $myPrep     the text prepared to output
+     @return true, if rendering happens, false in all other cases
+    */
+    function render($mode, &$renderer, $data)
+    {
+        if ($mode == 'xhtml') {
+            $pagearr = file("http://userfriendly.org/");
+            if (!is_array($pagearr))
+                return -1;
+            foreach ($pagearr as $line) {
+                if (substr($line, 0, 50) == '<A href="http://ars.userfriendly.org/cartoons/?id=') {
+                    $srcpos = strpos($line, 'SRC="http://www.userfriendly.org/cartoons/');
+                    $srclen = strlen($line) - $srcpos - 10;
+                    $picid = substr($line, $srcpos + 4, $srclen);
+                    $linkstart = '<a href="http://userfriendly.org/">';
+                    $imgalt    = 'userfriendly.org daily cartoon';
+                } // if URL in this line
+            } // foreach ($pagearr as $line)
+// debug line
+$renderer->doc .= "<p>{$linkstart}This was *YOUR* link here.</a></p>\n";
+            $myPrep = '<p><a href="http://userfriendly.org/">' .
+                      '<img src=' . $picid .' alt="' . $imgalt .
+                      '" title="' .  $imgalt .'" /></a></p>'. "\n";
+// debug line
+$renderer->doc .= "\n <p> " . htmlentities($myPrep) . '</p>';
+// the next line causes the strange behaviour
+//            $renderer->doc .= "\n" . $myPrep;
+            return true;
+       } // if ($mode == 'xhtml')
+        return false;
+    } // function render
+} // class syntax_plugin_userfriendly
+//Setup VIM: ex: et ts=4 enc=utf-8 :
+</code>